domainsexpiry.comtaken
Domain names are the doorway or addresses for your virtual real estate on the Internet. Unfortunately, when you buy a domain name it's not permanent for you to keep forever, you're basically leasing the name for a duration. for eg. 1 year, 2 year, etc...
Registrars (for eg. GoDaddy) where you register domain name offer up to 10 years but still if you forget to remember you'll lose the name.
It may be helpful to have a service to remind domain owners of expiry besides features offered by registrars. This .com TLD with exact terms domains & expiry would be an ideal name for that kind of service.
Other possibilities are to help catch expiring domains for potential buyers, blogs, or other services around the domain niche.